Oerustone

Oerustone is a type of sedimentary rock that forms through the compaction and cementation of oolitolithic clastic sediments, primarily composed of limestone and dolostone debris. The term "oerustone" was first introduced by geologist V.M. Goldreich in 1967. This type of rock is often found in shallow water environments, such as tidal flats, beaches, and coastal islands, where the ocean's waves and currents concentrate calcium carbonate and dolostone particles.

Oerustone is characterized by its distinctive sedimentary texture, which is primarily composed of cemented ooliths, intraclasts, and other lithoclasts. The presence of these clastic sediments together with the high concentration of calcium carbonate and dolostone minerals gives the rock its rigid structure. The cementing agents responsible for the rock's formation are typically calcium carbonate, aragonite, and dolostone minerals.

Geological studies have shown that oerustone formations often date back to the Eocene to Pliocene epochs, as this was a time when shallow seas and marine transgressions advanced into the paralic and coastal areas. The prevalence of oerustones in sedimentary basins like Central Asia, the Mediterranean, and the Caribbees, can be related to paleo-oceanic environments deposited primarily as oolithic points.

The study of oerustones has made significant contributions to the understanding of geological evolutionary processes, such as sedimentary units and facies variation, on continental shelves. In terms of engineering and economic applications, oerustone is of interest due to its intricate growth structures and mineral composition, which affects rock mechanical properties and engineering values like density, porosity, and permeability.